整数と浮動小数点数

明解Ｃ言語入門編 > 2. 演算と型 >

C



#include <stdio.h>

int main(int argc, char* argv[])

{

    int     nx;

    double  dx;
    nx = 9.99;

    dx = 9.99;
    printf(" int  型変数nxの値：%d\n", nx);

    printf("            nx / 2：%d\n", nx / 2);
    printf("double型変数dxの値：%f\n", dx);

    printf("            dx/2.0：%f\n", dx / 2.0);
    return 0;

}

実行結果



R:\>lesson010\project1.exe

 int  型変数nxの値：9

            nx / 2：4

double型変数dxの値：9.990000

            dx/2.0：4.995000

C++



#include <iostream.h>
int main(int argc, char* argv[])

{

    int     nx;

    double  dx;
    nx = 9.99;

    dx = 9.99;
    cout << " int  型変数nxの値：" << nx     << endl;

    cout << "            nx / 2：" << nx / 2 << endl;
    cout << "double型変数dxの値：" << dx       << endl;

    cout << "            dx/2.0：" << dx / 2.0 << endl;
    return 0;

}

実行結果



T:\>lesson010\Project1.exe

 int  型変数nxの値：9

            nx / 2：4

double型変数dxの値：9.99

            dx/2.0：4.995

Delphi



program Project1;
{$APPTYPE CONSOLE}
uses

    SysUtils;

var

    nx: Integer;

    dx: Double;

begin

    nx := 9;

    dx := 9.99;
    write(format(' int  型変数nxの値：%d'#13#10, [nx]));

    write(format('            nx / 2：%d'#13#10, [nx div 2]));
    write(format('double型変数dxの値：%1.6f'#13#10, [dx]));

    write(format('            dx/2.0：%1.6f'#13#10, [dx / 2.0]));

end.

実行結果



S:\>lesson010\project1.exe

 int  型変数nxの値：9

            nx / 2：4

double型変数dxの値：9.990000

            dx/2.0：4.995000

Perl

$nx = 9.99;
$dx = 9.99;

print " int  型変数nxの値：", int($nx),     "\n";
print "            nx / 2：", int($nx / 2), "\n";

print "double型変数dxの値：", $dx,     "\n";
print "            dx/2.0：", $dx / 2, "\n";

実行結果



L:\>perl lesson_02_010.pl

 int  型変数nxの値：9

            nx / 2：4

double型変数dxの値：9.99

            dx/2.0：4.995

Ruby

nx = 9.99
dx = 9.99

print " int  型変数nxの値：", nx.to_i,     "\n"
print "            nx / 2：", nx.to_i / 2, "\n"

print "double型変数dxの値：", dx,     "\n"
print "            dx/2.0：", dx / 2, "\n"

実行結果



L:\>ruby  l:\lesson_02_010.rb

 int  型変数nxの値：9

            nx / 2：4

double型変数dxの値：9.99

            dx/2.0：4.995